fhist: command not found

Maybe Your $PATH variable doesn't contain the default paths? echo $PATH should give something like:

[root@server ~]# echo $PATH
/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin

If it's empty, You may set the PATH variable with this command

export PATH="/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin"

On Debian possible default full paths are:

/usr/bin/fhist - from package: fhist

You may install the required package with command apt-get install {package}

Error in other languages:
fhist: bevel nie gevind nie
fhist: comandă negăsită
fhist: comando não encontrado
fhist: commande introuvable
fhist: command not found
fhist: käsku ei ole
fhist: không tìm thấy lệnh
fhist: komanda nerasta
fhist: Kommando nicht gefunden.
fhist: kommandot finns inte
fhist: komut yok
fhist: nie znaleziono polecenia
fhist: níor aimsíodh an t-ordú
fhist: no se encontró la orden
fhist: no s'ha trobat l'ordre
fhist: opdracht niet gevonden
fhist: parancs nem található
fhist: perintah tidak ditemukan
fhist: príkaz nenájdený
fhist: příkaz nenalezen
fhist: команда не найдена
fhist: командата не е открита
fhist: 命令找不到
fhist: コマンドが見つかりません